package com.hmall.gateway.filter;

import cn.hutool.core.text.AntPathMatcher;
import com.hmall.gateway.config.AuthProperties;
import com.hmall.gateway.config.JwtProperties;
import com.hmall.gateway.utils.JwtTool;
import lombok.RequiredArgsConstructor;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@RequiredArgsConstructor
@EnableConfigurationProperties(AuthProperties.class)
public class AuthGlobalFilter implements GlobalFilter , Ordered {
    private final JwtProperties jwtProperties;
    private final AuthProperties authProperties;
    private final AntPathMatcher antPathMatcher =new AntPathMatcher();
    private final JwtTool jwtTool;
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.判断是否要进行登陆的请求
        ServerHttpRequest request = exchange.getRequest();
        if (isExclude(request.getPath().toString())) {
            return chain.filter(exchange);
        }
        //2.获取请求头的属性
        String token = request.getHeaders().getFirst("Authorization");
        //3.获取令牌，获得用户信息
        try {
            Long userId = jwtTool.parseToken(token);
            //4将用户信息传递到后端微服务
            System.out.println("userId:-------------------------------------" + userId);

            // 修改请求头并构建新的 exchange
            ServerWebExchange newExchange = exchange.mutate()
                    .request(builder -> builder.header("user-info", userId.toString()))
                    .build();
            //校验通过则放行
            return chain.filter(newExchange); // 使用新的 exchange
        } catch (Exception e) {
            //校验不通过则返回，没有授权401
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
    }
    private boolean isExclude(String path) {
        for (String excludePath : authProperties.getExcludePaths()) {
            if(antPathMatcher.match(excludePath, path)){
                return true;
            }
        }        
        return false;
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
